cabal check warns about -O2 even if it is just a flag #7423
Description
I have a .cabal-file that passes ghc-options: -O2 under a specific flag:
https://raw.githubusercontent.com/haskell-hvr/regex-tdfa/master/regex-tdfa.cabal
cabal check issues a warning.
$ cabal check
Warning: These warnings may cause trouble when distributing the package:
Warning: 'ghc-options: -O2' is rarely needed. Check that it is giving a real
benefit and not just imposing longer compile times on your users.
I think the warning should not be issued if -O2 is only passed to ghc under a flag.